{
  "schema_version": 1,
  "name": "Quarkpad owner noise comparison receipt",
  "updated_at": "2026-08-18",
  "scope": "Two owner-entered LAeq observations from one exact GPU, shroud revision, room, meter position, and operating method.",
  "local_only": true,
  "metric": "LAeq dBA",
  "distance_m": 0.5,
  "minimum_duration_seconds": 30,
  "frequency_weighting": "A",
  "response": "slow",
  "required_inputs": [
    "exact GPU model and board or OEM number",
    "one shroud revision",
    "meter or app and microphone",
    "calibration note and room note",
    "background LAeq",
    "fan model, setting, observed RPM, LAeq, and duration for both setups",
    "same case, workload, airflow, power, microphone position, and method confirmed"
  ],
  "stop_flags": [
    "fan stopped or surged",
    "unexpected vibration or movement",
    "lead or connector became warm",
    "temperature or physical warning appeared"
  ],
  "outcomes": [
    "stop",
    "method-recheck",
    "background-recheck",
    "owner-comparison-recorded"
  ],
  "not_claimed": [
    "certified sound measurement",
    "sound power level",
    "hearing-safety assessment",
    "product noise rating",
    "quietest fan",
    "fit approval",
    "electrical approval",
    "cooling performance"
  ],
  "sources": [
    "https://www.cdc.gov/niosh/noise/prevent/understand.html",
    "https://www.cdc.gov/niosh/noise/about/app.html"
  ]
}